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Rectifier Bridge

Fig 1: Bench Testing Rectifier Bridge & ID of End Frame Components
G770
CAUTION: Never use 110-volt test lamp for this test.
  1. Connect one ohmmeter lead to grounded heat sink. Connect other ohmmeter lead firmly against flat metal portion of terminal (not threaded stud). See Fig 1 . Then reverse leads to same heat sink and terminal. If both readings are the same, replace rectifier bridge.
  2. A good rectifier bridge will give one high and one low reading. Repeat this same test between grounded heat sink and other 2 flat metal connectors. Then repeat same tests, this time between insulated heat sink and each of the 3 flat metal portions of connectors.
  3. Check other bridge rectifiers in same manner. DO NOT  replace rectifier bridge or diode trio unless at least one pair of readings is the same.
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